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Underground Lighting  |  SKU: Wt21-W

2021+ Ford F-150 STX LED Reverse Backup Replacement Bulbs for 3X Rear Visibility | 4257 White, Built-in Resistor, No Error Codes, | 3X Brighter 1200LM (PAIR)

$64.99 $69.99

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OEM halogen Bulbs fade over time & need replacement

  • 300% brighter than halogen for clearer reversing
  • Built-in resistor prevents CANBUS error codes
  • Advanced cooling extends lifespan up to 10Ɨ longer
  • Plug & play design, zero wiring required
  • Designed in USA, assembled with Japanese components

Why This Reverse Backup Bulb for Ford Beats Everything Else

- Low-output halogen bulbs limit rear visibility at night.Ā Standard halogen produces ~300ā€“400 lumens, reducing clarity. 1200-lumen LED output improves illumination, helping drivers detect obstacles, curbs, and pedestrians earlier.

- 54 SMD LEDs produce 1200 lumens across a 360Ā° beam angle, ensuring wide-area illumination behind the vehicle. This improves parking accuracy, camera visibility, and low-light manoeuvring.

- Direct fit for Ford F-150 STX Models from 2021 onwards, for exact fitment check compatibility or try our vehicle search tool

- Modern systems detect low resistance from LEDs and trigger warnings.Ā Built-in resistor simulates factory load, ensuring CANBUS compatibility and eliminating dashboard error codes without additional components.

- Excess heat reduces LED efficiency and lifespan. The fan + metal heatsink system regulates temperature, maintaining stable brightness output and extending lifespan up to 50Ɨ longer than halogen bulbs.

- 4257 / WT21 direct-fit base with non-polar design integrates with 12V systems. No wiring or modifications required, ensuring quick installation and immediate performance.

- Designed in the USA and built with Japanese components, ensuring durability and precision. Improved thermal and electrical stability delivers consistent 1200-lumen output and long-term reliability.

- Installation time is approximately 10 minutes. There is no need for slicing or complicatedĀ wiring. This light is a plug-n-play installation and operation.

Works for 99.9% of vehicles. Choose the best LED Turn Signal Replacement bulb for your Ford 150, 250, 350 from our completeĀ turn signalsĀ andĀ switchback collectionĀ with ourĀ Ford turn signal guide

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Do you have questions about the application, installation, shipping, warranty, or more? Do not hesitate to reach out to Underground Lighting and talk to a specialist. Chat with us online by hitting the chat button or call us at (561) 918-5225. We are here to help

    WHAT'S INCLUDED

    WARRANTY :
    Includes a 1-Year Manufacturer Warranty covering defects under normal use.

    PRODUCT INFORMATION

    Function - Reverse / Backup Light

    Voltage - 12V DC

    Variant - 4257

    LED Chips - 54 SMD LEDs

    Beam Angle - 360Ā° Coverage

    Color - White

    Cooling System - Fan + Metal Heatsink

    Electrical Design - CANBUS, Non-polar, CK Compatible

    Error Codes - No (Built-in resistor)

    Installation - Plug & Play

    Quantity - Pack of 2

    TECH SPECS

    WATTAGE :
    24W
    INTENSITY :
    1200 Lumens per bulb
    This product has a Includes a 1-Year Manufacturer Warranty covering defects under normal use.

    Covers manufacturing defects under normal use:

    • LED chip failure
    • Cooling system malfunction (fan/heatsink)
    • Electrical faults (resistor/CANBUS issues)

    Does not cover physical damage, incorrect installation, corrosion, or water ingress from broken housings.

    Yes, we offer free shipping on orders over $89.

    Yes, they consume 90% less power than traditional bulbs, making them energy-efficient and eco-friendly.Ā 

    Yes, ours is unique and different from other competitors.
    Unlike other brands out there that don't work, ours will. We specially designed the circuit board to work with the BCM.

    No, the LED does get hot, but not as hot as an incandescent bulb.

    No LEDs run cooler than OEM bulbs and will not harm or cause any damage to your wiring harness or housings. And our LEDs have an advanced cooling system, making it efficient and durable with a lifespan of 25k+ hours

    Did you start the engine before testing? The vehicle engine must be on and running for the BCM to turn on for the load resistors to be detected. Read the Hyperflash guide & know the details

    COMPATIBILITY

    FITMENTS :
    2023 Ford F150 STX ā€“ Backup Light, 2023 Ford F-150 ā€“ Backup Light, 2022 Ford F150 STX ā€“ Backup Light, 2021 Ford F150 STX ā€“ Backup Light, 2022 Ford F-150 ā€“ Backup Light, 2021 Ford F-150 ā€“ Backup Light

    • Talk to a REAL Human Expert

      Call us (561) 918-5225

    • 1-2 Year Warranty

      30 Day Quick Return

    • Free Shipping

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